WO2009047968A1 - ノイズキャンセルヘッドホン - Google Patents
ノイズキャンセルヘッドホン Download PDFInfo
- Publication number
- WO2009047968A1 WO2009047968A1 PCT/JP2008/066893 JP2008066893W WO2009047968A1 WO 2009047968 A1 WO2009047968 A1 WO 2009047968A1 JP 2008066893 W JP2008066893 W JP 2008066893W WO 2009047968 A1 WO2009047968 A1 WO 2009047968A1
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- WIPO (PCT)
- Prior art keywords
- signal
- noise
- cancellation
- headphone
- level
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
Definitions
- the present invention is a noise cancellation headphone which can cancel out noise and listen to only music by outputting a signal for canceling ambient noise together with music, and in particular, cancel processing according to the level of ambient noise.
- the noise cancellation headphone is a microphone that is attached to the headphone housing or the like to collect ambient noise and use it as an input signal, and generates a signal that is the opposite phase of this input signal.
- an anti-phase signal cancel signal
- music By outputting an anti-phase signal (cancel signal) and music from the speaker unit with which the headphone is provided, surrounding noise can be canceled by the cancel signal output from the speed unit and only music can be heard. is there.
- the noise cancellation headphone since the noise cancellation headphone generates a cancellation signal based on the ambient noise picked up by the sound collection microphone, the ambient noise may temporarily indicate the ambient condition (eg, a siren, a horn, etc. Even if it is "ambient sound", it generates and outputs a cancellation signal to cancel this.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2 0 0 5-5 2 6 3 7 5 Disclosure of the Invention
- the noise cancellation headphone described in the above document has a sufficiently small noise in the surrounding area, and the noise cancellation circuit continues to operate even in an environment where the noise cancellation process is unnecessary. It also generates and outputs cancellation signal for.
- the music output from the speaker unit may slightly change the sound quality under the influence of this cancellation signal.
- the internal noise of the noise cancellation circuit itself may be larger. In this case, the cancellation signal itself becomes noise, which adversely affects the sound quality.
- the noise cancellation circuit generally uses a battery as a driving power supply, unnecessary noise cancellation processing wastes the battery and there is a problem in maintaining the noise cancellation cell processing for a long time.
- the present invention automatically controls the generation process of the cancellation signal by comparing the level of the reference signal and the level of the ambient noise which can be arbitrarily set by the user. It is an object of the present invention to provide a noise canceler headphone that can be used as a normal headphone and can be operated as a normal headphone and can be driven for a long time with high sound quality at noise levels where the Yansel process is unnecessary. Means to solve the problem
- the present invention comprises a microphone for converting ambient noise into an electrical signal, cancellation signal generation means for inverting the phase of the noise signal converted by the microphone to generate a cancellation signal, and mixing an audio signal and the above cancellation signal.
- a noise-canceling headphone including a speaker for outputting the reference signal, the reference signal generating means for determining the level of the reference signal, and the comparison means for outputting the result of comparing the noise signal and the reference signal.
- the cancel signal generation means is characterized mainly in that the operation is started by the output of the comparison means.
- a microphone for converting ambient noise into an electrical signal
- a cancel signal generating means for inverting a phase of a noise signal converted by the microphone to generate a cancel signal, an audio signal and the cancel cell.
- a noise cancellation headphone comprising: a speaker for mixing and outputting signals; and a reference level generation means for generating a reference signal corresponding to the noise signal, and a result of comparison between the noise signal and the reference signal.
- the cancellation signal generation means is characterized mainly in that the operation is stopped by the output of the comparison means.
- the present invention is characterized by further comprising reference level adjustment means for adjusting the generation level of the reference signal.
- the noise canceling process is stopped when the level of the collected ambient noise is small, and the noise canceling process is performed only when the level of the collected ambient noise is large. In this way, the noise cancellation process can be operated for a long time without degrading the sound quality of the music.
- FIG. 1 is a partial cross-sectional external view showing an embodiment of a noise cancellation headphone according to the present invention.
- FIG. 2 is a block diagram showing an example of a noise cancellation circuit included in the noise cancellation headphone.
- FIG. 3 is a flow chart showing an example of the above noise cancellation processing of headphone.
- FIG. 4 is a flow chart showing another example of the above noise cancellation processing of headphone.
- FIG. 5 is a block diagram showing another example of the noise cancellation circuit provided in the noise cancellation headphone according to the present invention.
- FIG. 6 is a flowchart showing another example of the above-mentioned headphone cancellation.
- FIG. 7 is a flow chart showing another example of the above noise cancellation processing of headphone.
- FIG. 8 is a block diagram showing an example of a mute circuit included in the above noise cancellation head phone. Explanation of sign
- FIG. 1 is a schematic view showing only one side of the noise cancellation headphone housing configured as a left and right pair.
- a headphone unit 1 includes a cancellation signal generator (hereinafter referred to as “NC”) 10 configured mainly of a DSP (digital signal processor) that generates a cancellation signal, and the noise cancellation headphone.
- NC cancellation signal generator
- DSP digital signal processor
- Microphones 30 designed toward the outside of the headphone 1 to collect noise N around the users of the users, through holes 102 provided in a part of the headphone 1 and NC (10) Switching switch 40 for selecting the level of the reference signal used to judge the operation of 0, mixer 50 for combining the output of NC 10 and the music signal S, and output of mixer 50 It has a speaker unit 60 that outputs the combined signal of S and cancellation signal) to the user's ear 200. Further, the headphone unit 1 contains a battery (not shown) that is a driving power supply of the NC 10. The music signal S is manually input from a portable music player (not shown) or the like. As shown in FIG.
- the noise N collected by the microphone unit 30 is input to the NC unit 10 to generate a cancellation signal, which is then output by the speed unit 60.
- the switching switch 40 can switch the level of the reference signal used to determine whether or not the cancellation signal generation process needs to be performed.
- the mixer 50 synthesizes the music signal S and the cancel signal which is the output of the NC 10 and outputs it to the speech power unit 60. In this way, when the sound by the cancel signal and the music signal S is output from the speaker unit 60, the noise N and the cancel signal cancel each other, and only the sound by the music signal S can be delivered to the ear 200 become. Details of the above NC 10 will be described using the block diagram of FIG. In FIG.
- NC 10 includes a microphone amplifier 11 that amplifies noise N collected by microphone unit 30 to a predetermined level, and a phase adjustment unit 12 that adjusts the phase of amplified noise N.
- Low pass filter (LPF) 1 3 that removes high frequency components of noise N
- AZD 14 that converts noise N into digital signals
- DSP 1 5 that generates a cancellation signal of noise N converted into digital signals
- DS The D / A 16 which converts the cancellation signal generated by P 15 into an analog signal
- the boost filter 17 which smoothes the cancellation signal converted into an analog signal
- the driving unit 60 for driving the speed unit 60.
- a reference signal generation circuit 20 for generating a reference signal to be a reference used by the comparison circuit 1 8;
- Ddoho Nyunitto 1 switching Suitsuchi 40 installed outside the casing wall, and a reference adjustment circuit 2 1 a user can arbitrarily change the level of the reference signal.
- the comparator circuit 18 is only required to determine the level of the noise N. Therefore, the comparator circuit 18 is not limited to the output of the microphone amplifier 11.
- the output of the phase adjustment circuit 12 or the output from the LPF 13 may be input.
- the comparison circuit 18 compares the level of the noise N with the level of the reference signal generated by the reference signal generation circuit 20.
- the DSP 15 and the headphone amplifier 1 Outputs a control signal that instructs 9 to stop operation. Also, the comparison circuit 18 compares the level of the noise N with the level of the reference signal, and if the level of the noise N is larger than the level of the reference signal, Outputs a control signal to instruct start of operation.
- the cancel signal output through the headphone amplifier 19 is combined with the music signal S in the mixer 50 and output from the speaker unit 60.
- the noise cancellation head phone starts operation according to the level of the noise inputted from the microphone switch 1 and the mode in which the noise cancellation circuit starts operation when the power is turned on, and the noise cancellation circuit does not operate when the power is turned on.
- Figure 3 shows the flow of operation in the mode in which the noise cancellation circuit is operated by turning on the power.
- the noise N input from the microphone unit 30 is amplified to a predetermined level by the microphone amplifier 11, and input to the comparison circuit 18.
- the level of the noise N and the reference signal circuit 20 generate the reference Compare with the level of the signal (S 3 0 1).
- the comparator circuit 18 does not output the control signal, so NC 10 continues its operation.
- a cancellation signal corresponding to the noise N is generated by the DSP 1 5, and this cancellation signal is output to the mixer 50 through the headphone amplifier 19, synthesized with the music signal S, and output from the speaker unit 60.
- the comparison circuit 18 determines that the level of the noise N input from the microphone unit 30 is smaller than the level of the reference signal, it outputs a control signal instructing the headphone amplifier 19 to stop the operation (S 3 0 3). As a result, the headphone amplifier 19 stops the output operation to the speed amplifier 60.
- the comparator circuit 18 outputs a control signal instructing the DSP 15 to stop its operation (S304). As a result, the DSP 15 stops the cancellation signal generation process.
- Fig. 4 shows the flow of operation in the mode where operation is started by the level of noise input from microphone 1 at power on without operating the noise cancellation circuit.
- the noise N input from the microphone unit 30 is amplified to a predetermined level by the microphone amplifier 11, and input to the comparison circuit 18.
- the noise N and the level of the reference signal generated by the reference signal circuit 20 are Compare (S 4 0 1). When the level of noise N is small, since comparator circuit 18 does not output anything, DSP 1 5 and headphone amplifier 1 9 also do not operate, and nothing is output from NC 10 to mixer 50.
- the comparison circuit 18 If the level of the noise N is larger than the level of the reference signal, the comparison circuit 18 outputs a control signal instructing the DSP 15 to change the operation mode (S 40 2). Due to this, the DSP 15 starts the operation of generating the cancel signal for the noise N inputted. Next, the comparison circuit 18 outputs a control signal instructing the headphone amplifier 19 to start operation (S 4 0 3). As a result, the generated cancel signal is output to the mixer 50, combined with the music signal S and the cancel signal, and then output to the speech power unit 60, so that the sound by the cancel signal and the music signal S is output. Spy Force Unit 6 Output from 0. Next, another embodiment of the cancellation signal generator (NC) that can be used for the noise cancellation head phone according to the present invention will be described.
- NC cancellation signal generator
- NC 10 a The details of the NC 10 a according to this embodiment are shown in FIG. NC l O a has a configuration in which a mute circuit 22 is added to the already described NC 10. Therefore, Figure 2 The same reference numerals are given to the same components as NCI 0 already described above, and the explanation will be omitted.
- the mute circuit 22 is a circuit that electrically disconnects the headphone amplifier 19 and the speaker unit 60 when the noise N is smaller than the level of the reference signal.
- the DSP 15 and It When the comparator 18 compares the level of the noise N with the level of the reference signal generated by the reference signal circuit 21 and determines that the level of the noise N is smaller than the reference signal, the DSP 15 and It outputs a control signal to instruct the operation stop to the dophone amplifier 19 and also outputs a control signal to instruct the mute circuit 22 to start the operation.
- the mute circuit 22 electrically disconnects between the headphone amplifier 1 9 and the speaker unit 60, and the NC 10 and the mixer 50 are electrically disconnected. According to the mute circuit 22 which operates in this manner, the internal force and the like possessed by the NC 10a are not output from the SPY power unit 60, and a voice based on only the high-quality music signal S is output.
- Figure 8 shows an example of the circuit configuration of the mute circuit 22.
- the output terminal of headphone amplifier 19 is connected to mixer 50 via mute circuit 22.
- the mute circuit is constituted by a transistor, and when the control signal from the comparison circuit 18 is input to the base terminal, the collector terminal connected to the output terminal of the headphone amplifier 19 and the emitter terminal connected to ground are The output from the headphone amplifier 19 is short-circuited and is not output to the mixer 50.
- the mute circuit 22 even if there is internal noise peculiar to the amplifier circuit, the speaker unit 60 or it will not be output.
- the noise cancellation circuit in the mode in which the noise cancellation circuit starts to operate when the power is turned on, and when the power is turned on, the noise cancellation circuit does not operate. It has a mode to start operation by 0.
- This embodiment is an example of a mode in which the noise cancellation circuit is operated by turning on the power.
- the noise N input from the microphone unit 30 is amplified to a predetermined level by the microphone amplifier 11, and input to the comparison circuit 18.
- the level of the noise N and the reference signal generated by the reference signal circuit 20 Compare with the level of (S601).
- the comparison circuit 18 does not output anything, a cancel signal corresponding to the noise N is generated in the DSP 15, and each cancel signal is mixed via the headphone amplifier 19.
- the signal is output at 50 and combined with the music signal S and output from the speaker unit 60 (S602). If the comparison circuit 18 determines that the level of the noise N input from the microphone unit 30 is smaller than the level of the reference signal, the comparison circuit 18 stops the operation of the headphone amplifier 19. The control signal to be instructed is output (S603). As a result, the headphone amplifier 19 stops the output to the mixer 50. Next, the comparison circuit 18 outputs a control signal instructing the DSP 1 5 to stop its operation (S604). The DSP 15 that received the control signal stops the process of generating the cancellation signal for the input noise N. Next, the comparison circuit 18 outputs a control signal to the mute circuit 2 2 (S 6 0 5).
- the mute circuit 22 grounds the output terminal of the headphone amplifier 19 by the control signal, the NC 10 a, the mixer 50, and the speaker unit 60 are electrically disconnected. As described above, if the noise N level is smaller than the reference signal level, noise cancellation processing is not performed, and the output of the headphone amplifier is also stopped, and electrical disconnection is also performed by the mute circuit 22. From Unit 60, it becomes possible to output only the sound of the music signal S without causing other signals (amplifier noise) and sound quality changes due to signal processing. Next, another example of the operation of the NC 10 a will be described using the flowchart of FIG.
- the output of the headphone amplifier is stopped because the noise N input from the microphone unit 30 is equal to or smaller than the reference signal level, the DSP is changed to the sleep mode, and the mute circuit is operating.
- This is the flow of processing when noise N is further input from microphone unit 30.
- the noise N input from the microphone unit 30 is amplified to a predetermined gain by the microphone amplifier 11, and input to the comparison circuit 18.
- the level of the noise N and the reference signal generated by the reference signal circuit 20 Compare with the level of (S 701).
- the comparison circuit 18 determines that the level of the noise N input from the microphone unit 30 is smaller than the level of the reference signal, the control signal output from the comparison circuit 18 is, as described above, The output of the headphone amplifier 19 is stopped, the DSP 15 stops the cancel signal generation processing, and the mute circuit 22 operates so as to ground the output terminal of the headphone amplifier 19 (S 70 3, S 70 4, S 7 0 5). If the noise N level is higher than the reference signal level, the comparison circuit 18 outputs a control signal instructing the DSP 15 to start an operation to generate noise cancellation (S 70 2 ). Next, the comparison circuit 18 outputs a control signal instructing the headphone amplifier 19 to start the operation (S 7 0 6). As a result, the headphone amplifier 19 starts output to the mixer 50.
- the comparison circuit 18 stops the output of the control signal to the mute circuit 2 2 (S 7 0 7).
- the output signal of the headphone amplifier 19 is output to the mixer 50.
- the noise cancellation processing is stopped, if the level of the input noise N is larger than the level of the reference signal, the noise cancellation processing can be started again, and the noise cancellation signal can be started. Since the internal circuit can avoid the output by the mute circuit, it becomes possible to output only the sound by the music signal S without causing the change of the sound quality by the signal processing.
- NC 10 and NC 10 a are processing for generating a cancellation signal by digital signal processing using DSP, the present invention is not limited to this and an analog circuit is used. The same processing can be performed even if the noise cancellation circuit is configured.
- music signal refers to so-called audio signals as well as general music signals, and may also be referred to as "tone signals”.
- the present invention is also applicable to noise cancellation processing in various acoustic systems such as concert halls and car audios that reproduce and output music signals.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
- Headphones And Earphones (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009536958A JPWO2009047968A1 (ja) | 2007-10-10 | 2008-09-11 | ノイズキャンセルヘッドホン |
US12/681,639 US20100226505A1 (en) | 2007-10-10 | 2008-09-11 | Noise canceling headphone |
CN200880110957A CN101822071A (zh) | 2007-10-10 | 2008-09-11 | 头戴式消噪耳机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-264423 | 2007-10-10 | ||
JP2007264423 | 2007-10-10 |
Publications (1)
Publication Number | Publication Date |
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WO2009047968A1 true WO2009047968A1 (ja) | 2009-04-16 |
Family
ID=40549113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/066893 WO2009047968A1 (ja) | 2007-10-10 | 2008-09-11 | ノイズキャンセルヘッドホン |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100226505A1 (ja) |
JP (1) | JPWO2009047968A1 (ja) |
CN (1) | CN101822071A (ja) |
WO (1) | WO2009047968A1 (ja) |
Cited By (3)
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JP2018509039A (ja) * | 2015-01-26 | 2018-03-29 | シェンチェン グランドサン エレクトロニック カンパニー,リミテッド | ヘッドセットの騒音低減方法及び装置 |
KR20190136177A (ko) * | 2018-05-30 | 2019-12-10 | 한국과학기술연구원 | 소리 제거 시스템 및 이를 이용한 소리 제거 방법 |
KR20200054923A (ko) * | 2020-05-07 | 2020-05-20 | 한국과학기술연구원 | 소리 제거 시스템 및 이를 이용한 소리 제거 방법 |
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US9020158B2 (en) | 2008-11-20 | 2015-04-28 | Harman International Industries, Incorporated | Quiet zone control system |
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US8718289B2 (en) | 2009-01-12 | 2014-05-06 | Harman International Industries, Incorporated | System for active noise control with parallel adaptive filter configuration |
US8189799B2 (en) * | 2009-04-09 | 2012-05-29 | Harman International Industries, Incorporated | System for active noise control based on audio system output |
US8199924B2 (en) | 2009-04-17 | 2012-06-12 | Harman International Industries, Incorporated | System for active noise control with an infinite impulse response filter |
US8077873B2 (en) | 2009-05-14 | 2011-12-13 | Harman International Industries, Incorporated | System for active noise control with adaptive speaker selection |
US9099077B2 (en) * | 2010-06-04 | 2015-08-04 | Apple Inc. | Active noise cancellation decisions using a degraded reference |
US8515089B2 (en) | 2010-06-04 | 2013-08-20 | Apple Inc. | Active noise cancellation decisions in a portable audio device |
US8571226B2 (en) | 2010-12-10 | 2013-10-29 | Sony Corporation | Automatic polarity adaptation for ambient noise cancellation |
JP5817113B2 (ja) * | 2010-12-24 | 2015-11-18 | ソニー株式会社 | 音声信号出力装置、音声出力システム、音声信号出力方法 |
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KR102196519B1 (ko) * | 2020-05-07 | 2020-12-30 | 한국과학기술연구원 | 소리 제거 시스템 및 이를 이용한 소리 제거 방법 |
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JPWO2009047968A1 (ja) | 2011-02-17 |
US20100226505A1 (en) | 2010-09-09 |
CN101822071A (zh) | 2010-09-01 |
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